| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.fs; |
| |
| import org.apache.hadoop.thirdparty.protobuf.ByteString; |
| import org.apache.hadoop.fs.FSProtos.LocalFileSystemPathHandleProto; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.Objects; |
| import java.util.Optional; |
| |
| /** |
| * Opaque handle to an entity in a FileSystem. |
| */ |
| public class LocalFileSystemPathHandle implements PathHandle { |
| |
| private final String path; |
| private final Long mtime; |
| |
| public LocalFileSystemPathHandle(String path, Optional<Long> mtime) { |
| this.path = path; |
| this.mtime = mtime.orElse(null); |
| } |
| |
| public LocalFileSystemPathHandle(ByteBuffer bytes) throws IOException { |
| if (null == bytes) { |
| throw new IOException("Missing PathHandle"); |
| } |
| LocalFileSystemPathHandleProto p = |
| LocalFileSystemPathHandleProto.parseFrom(ByteString.copyFrom(bytes)); |
| path = p.hasPath() ? p.getPath() : null; |
| mtime = p.hasMtime() ? p.getMtime() : null; |
| } |
| |
| public String getPath() { |
| return path; |
| } |
| |
| public void verify(FileStatus stat) throws InvalidPathHandleException { |
| if (null == stat) { |
| throw new InvalidPathHandleException("Could not resolve handle"); |
| } |
| if (mtime != null && mtime != stat.getModificationTime()) { |
| throw new InvalidPathHandleException("Content changed"); |
| } |
| } |
| |
| @Override |
| public ByteBuffer bytes() { |
| LocalFileSystemPathHandleProto.Builder b = |
| LocalFileSystemPathHandleProto.newBuilder(); |
| b.setPath(path); |
| if (mtime != null) { |
| b.setMtime(mtime); |
| } |
| return b.build().toByteString().asReadOnlyByteBuffer(); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| LocalFileSystemPathHandle that = (LocalFileSystemPathHandle) o; |
| return Objects.equals(path, that.path) && |
| Objects.equals(mtime, that.mtime); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(path, mtime); |
| } |
| |
| @Override |
| public String toString() { |
| return "LocalFileSystemPathHandle{" + |
| "path='" + path + '\'' + |
| ", mtime=" + mtime + |
| '}'; |
| } |
| |
| } |